Profile: Royal Roofings & Construction is a manufacturer of metal profiled sheets. We also offer a wide range of polycarbonate solid sheets, polycarbonate embossed sheets, and polycarbonate hollow sheets that are widely used in several fabrication industries. Twin wall polycarbonate sheet is available in various models and shapes. These are widely applicable for cabinetry, furniture, airports, doors, shopping malls, offices, and hotels. The structured sheet is economical and light in weight. Our polycarbonate multi-wall sheet can be easily cold formed, and will not crack or splinter when fabricated. Air exhaust ventilator is ideal for high performance industrial roofs. This ventilation system is driven by natural wind, and it's turbines operate by utilizing the velocity energy of the wind to induce airflow by centrifugal action. The centrifugal force caused by the spinning vanes creates a region of low-pressure area, which draws the air through the turbine. The air drawn out by the exhaust ventilator is continuously replaced by fresh air from outside.